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  <title>Verify that the contents of a variable is a countable value</title>
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  <div id="layout-content"><div id="function.is-countable" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">is_countable</h1>
  <p class="verinfo">(PHP 7 &gt;= 7.3.0)</p><p class="refpurpose"><span class="refname">is_countable</span> &mdash; <span class="dc-title">
   Verify that the contents of a variable is a countable value
  </span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.is-countable-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>is_countable</strong></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$var</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Verify that the contents of a variable is an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> or
   an object implementing <a href="class.countable.html" class="classname">Countable</a>
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.is-countable-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">var</code></dt>

     <dd>

      <p class="para">
       The value to check
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.is-countable-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>TRUE</code></strong> if <code class="parameter">var</code> is countable, <strong><code>FALSE</code></strong> 
   otherwise.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.is-countable-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>7.3.0</td>
      <td>
       <span class="function"><strong>is_countable()</strong></span> has been added.
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.is-countable-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-6363">
    <p><strong>Example #1 <span class="function"><strong>is_countable()</strong></span> examples</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">([</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">]));&nbsp;</span><span style="color: #FF8000">//&nbsp;bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new&nbsp;</span><span style="color: #0000BB">ArrayIterator</span><span style="color: #007700">([</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'baz'</span><span style="color: #007700">])));&nbsp;</span><span style="color: #FF8000">//&nbsp;bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new&nbsp;</span><span style="color: #0000BB">ArrayIterator</span><span style="color: #007700">()));&nbsp;</span><span style="color: #FF8000">//&nbsp;bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new&nbsp;</span><span style="color: #0000BB">stdClass</span><span style="color: #007700">()));&nbsp;</span><span style="color: #FF8000">//&nbsp;bool(false)</span>
</span>
</pre></div>
    </div>

   </div>   
  </p>   
 </div>


 <div class="refsect1 seealso" id="refsect1-function.is-countable-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="is_array.html" class="function" rel="rdfs-seeAlso">is_array()</a> - 检测变量是否是数组</span></li>
    <li class="member"><span class="function"><a href="is_object.html" class="function" rel="rdfs-seeAlso">is_object()</a> - 检测变量是否是一个对象</span></li>
    <li class="member"><span class="function"><a href="is_iterable.html" class="function" rel="rdfs-seeAlso">is_iterable()</a> - Verify that the contents of a variable is an iterable value</span></li>
    <li class="member"><span class="function"><a href="is_bool.html" class="function" rel="rdfs-seeAlso">is_bool()</a> - 检测变量是否是布尔型</span></li>
   </ul>
  </p>
 </div>


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